Transducers
The transducer connectors are colour coded to indicate function: the
US/FECG connector is red, the Toco connector is blue.
The transducers are held in place by elasticated straps.
Patient Event Marker
This is a hand-held push-button which is pressed by the patient when she
feels fetal or uterine activity.
F
The patient and clinical event markers are distinguished from each
other on the paper, patient at the bottom of the FHR grid and
clinical at the top.
1.4
Antistatic Handling, Electro Static Discharge (ESD)
The
Baby Dopplex
uses Electrostatic Discharge Sensitive Devices (ESD's) in its
manufacture. The damage they suffer when handled incorrectly may be catastrophi
c.
More often and potentially even worse, the damage may be partial or latent, seriously
impairing the reliability of the unit.
Due to the nature of the components used within the
Baby Dopplex
, special
precautions must be taken to avoid damage to the circuitry. Static damage may not
be immediately evident but could cause premature failure.
The
Baby Dopplex
must only be dismantled and serviced within an ESD protected
area (EPA) as defined by CECC00015 (published by CENELEC) to avoid damage to
the assemblies.
1.5
Construction
The main unit comprises five PCB's, the main PCB, display PCB, PSU, end of paper
PCB and rear panel connector PCB. All boards with the exception of the PSU are
populated with surface mounted components.
The toco transducer consists of a termination PCB and a strain gauge.
The ultrasound transducer contains a single PCB, a multi element piezo crystal array
and a circular termination PCB.
The FECG transducer contains a single PCB and isolation amplifier with two scalp
electrode connections and a legplate disk for a maternal connection.
All electromechanical and through hole components are serviceable using standard
tools and soldering techniques, provided that anti-static precautions are always taken.
Recommended servicing is limited to replacement of assemblies detailed in this
manual.
2
Issue: 2 Draft
Rev: a
614365
